System and method for managing projector bulb life

Abstract

Projector bulb life is managed to achieve desired performance parameters, such as a maximum life mode or maximum brightness mode, by sensing bulb luminance and applied the sensed luminance with a luminance feedback controller to drive the bulb to achieve the desired performance parameter. For instance, in maximum life mode the luminance feedback controller reduces power applied to the bulb to restrict bulb luminance to a maximum luminance setpoint when greater luminance is available with a newer bulb. In maximum brightness mode, the luminance feedback controller increases power applied to the bulb to increase bulb luminance if the sensor senses luminance below a threshold due bulb wear. Bulb life management improves project image illumination to display information in a variety of projector types, including digital mirror devices and liquid crystal displays.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates in general to the field of information display, and more particularly relates to a system and method for managing projector bulb life.[0003]2. Description of the Related Art[0004]As the value and use of information continues to increase, individuals and businesses seek additional ways to process and store information. One option available to users is information handling systems. An information handling system generally processes, compiles, stores, and / or communicates information or data for business, personal, or other purposes thereby allowing users to take advantage of the value of the information. Because technology and information handling needs and requirements vary between different users or applications, information handling systems may also vary regarding what information is handled, how the information is handled, how much information is processed, stored, or communicated, and how...

AI Technical Summary

Benefits of technology

[0008]In accordance with the present invention, a method and system are provided which substantially reduce the disadvantages and problems associated with previous methods and systems for managing a projector bulb life. A luminance feed back control loop senses luminance output by a projector bulb and provides a control signal to the projector bulb's power driver to maintain brightness output from the bulb so that the bulb has a desired performance, such as maximum life or maximum brightness over the bulb's life.

[0009]More specifically, a bulb is illuminated by a power driver that provides variable power to the bulb to generate variable brightness to illuminate information formed as an image, such as with a DMD or LCD display device. Bulb brightness is sensed by a luminance sensor and provided to a luminance feedback controller as a sense signal, such as a voltage. The luminance controller generates an error control signal that is fed back to the power driver to compensate for changes in bulb performance over time, such as arc length induced bulb brightness changes related to bulb aging. The luminance controller manages bulb luminance to obtain desired bulb performance parameters. In a maximum life mode, the luminance controller restricts bulb brightness to a threshold value by reducing the power provided to the bulb so that a new bulb with greater available brightness illuminates at a lower brightness level to reduce wear on the bulb. In a maximum brightness mode, the luminance controller increases bulb brightness to a threshold value by increasing power provided to the bulb so that an older bulb with degraded available brightness illuminates at a greater brightness level. In an unmanaged mode, the luminance controller is disengaged to allow a user to manually select a desired brightness.

[0010]The present invention provides a number of important technical advantages. One example of an important technical advantage is that consumers are presented with an information image from a projector with improved consistency in the brightness of the image. Consumers are provided with improved life of a projector's bulb and face reduced cost in the replacement of projector bulbs through the control of the power that drives a bulb based on feedback of the luminance output by the bulb. The control algorithm allows a user to select between bulb performance goals so that the user can have maximum available illumination from a new bulb or initially reduced illumination below a bulb's maximum available brightness as a tradeoff for longer bulb life and improved performance from the bulb as the bulb ages.

Problems solved by technology

However, obtaining high resolution images from CRT displays is difficult and often involves the use of bulky devices with relatively high power consumption.

One difficulty that remains with consumer acceptance of projector display devices is that the projector bulbs typically used in projector devices are expensive ultra high pressure mercury vapor or xenon halogen lamps that have a generally short life span of approximately 1500 hours.

Consumers are hesitant to invest in projector display devices for common home entertainment use where the projector display devices require frequent replacement of expensive bulbs.

Consumers are also hesitant to invest in projector display devices that have perceived performance problems, such as decreased available brightness as a projector bulb ages.

Images